已知x/2=y/3=z/4,xyz不等于0,求x+3y-2z/2x+y的值
已知4x-3y+z=0,x+2y-8z=0,xyz不等于0,求x+y-z/x-y+2z的值
已知{4x-5y 2z=0/x 4y-3x=0(xyz不等于0),求x:y:z:d的值
已知xyz不等于0,且x+2y-z=0,7x-y-z=0,求x+y+z/2x-y-z的值.
已知x/2=y/3=z/4,xyz不等于0,求x+3y-2z/2x+y的值
已知方程组4x-y+3z=0 2x+y+6z=0且xyz不等于0,则x/y+y/z+z/x是多少
方程组:x-2y+4z=0,2x+3y-3z=0...xyz不等于0,求(2x+y-z)\(2x-y+z)
已知xyz满足|3x-2y+z|+|2x+y+2z|=0(xyz不等于o)求x+y除以z
已知2X+5Y+4Z=0,3X+Y-7Z=0,且XYZ不等于0,求(X+Y+Z)/(2X-3Y+4Z)的值
已知x-y+z=0,2x-3y-4z=0,且xyz不等于0,求x平方+y平方+z平方/x平方+y平方-2倍z平方的值
已知x/2=y/3=z/4且xyz不等于0,求2x+3y-z/x-3y+z拜托各位了 3Q
已知xyz不等于0,且x/3=y/4=z/5,求【2x-3(2y-z)】/x+y+z
已知;4x-3y-6z=0,x+2y-7y=0(xyz不等于0),求2x+3y+6z/x+5y+7z的值